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Software Version

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PDF Version

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Online Version

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AEE Certified Energy Manager (CEM) Sample Questions:

1. How can commissioning reduce the life-cycle cost to owners and operators?

A) Improve the satisfaction of building occupants
B) Improve the effectiveness of operations and maintenance
C) Improve the performance of energy systems
D) Reduce the cost of change orders during construction
E) All of the above

2. A cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?

A) Static-pressure reset
B) Condenser-water temperature reset
C) Chiller demand limiting
D) Chilled-water temperature reset

3. An energy-saving project saves $30,000 per year. The project life is 10 years and the company minimum annual rate of return (MARR) is 15%. How much can the project cost and still be cost effective?

A) $198,992
B) $165,903
C) $201,123
D) $150,570
E) $188,343

4. Problems Caused by Harmonic Distortion
Which of the following problems is unlikely to be caused by harmonic distortion?
SELECT THE CORRECT ANSWER

A) Torque pulsation in motors
B) Degraded power factor C. Lighting "flicker"
C) "Nuisance" tripping of circuit breakers
D) Circulating currents in motor shafts

5. If outside air has a temperature of 25°C dry bulb and 15°C wet bulb, what is the enthalpy of the air?

A) 62 kJ/kg
B) 32 kJ/kg
C) 52 kJ/kg
D) 42 kJ/kg

Solutions: